house plant hydrometer PlantDoc Moisture Meter - Mini Monstera
SKU: 60521306777
house plant hydrometer

house plant hydrometer PlantDoc Moisture Meter - Mini Monstera

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Description

house plant hydrometer PlantDoc Moisture Meter - Mini MonsteraWhat is PlantDoc? You've just found the world's first and only 100% biodegradable, plastic free moisture meter. Meet PlantDoc. Saving lives, one plant at a time. The favourite tool of over waterers, under waterers and worried plant parents. Just what the (plant) doctor ordered to help solve your water worries. How does PlantDoc work? PlantDoc is a colour changing moisture meter that stays in your plant's pot, monitoring the moisture level at a glance.

What is PlantDoc?


You've just found the world's first and only 100% biodegradable, plastic-free moisture meter. Meet PlantDoc. Saving lives, one plant at a time. The favourite tool of over-waterers, under-waterers and worried plant parents. Just what the (plant) doctor ordered to help solve your water worries. 


How does PlantDoc work?


PlantDoc is a colour-changing moisture meter that stays in your plant's pot, monitoring the moisture level at a glance. No more guesswork. Pop it in a dry plant, white side facing out, and water as usual.


PlantDoc changes colour in response to the wet soil and the pattern appears. Your PlantDoc will slowly return to white as the soil dries out and it's time to water again. Simple!

What is PlantDoc made from?


PlantDoc is made from 100% biodegradable, compostable, sustainably-sourced plant-based fibres with non-toxic hydrochromatic colour-changing ink.


When it's ready to replace, pop it in the garden or your compost and PlantDoc completely breaks down with no residues. Safe for curious hands and paws with no harmful dyes or chemicals, making PlantDoc pet safe and kid safe. No batteries required.  

 

What comes in the box?


One box includes 5 PlantDocs, enough for around one years supply for one plant. One PlantDoc lasts one to six months each (depending on your soil type and watering frequency), so one 5 pack lasts from 5 to 30 months all up. All for just $4 per PlantDoc.


Sustainable, safe, non-toxic, biodegradable AND budget-friendly, a win for plants, plant parents, pets and the planet 💚


What substrates work best?


It might seem obvious, but because PlantDoc absorbs water from the substrate, which makes it change colour to tell you when to water when it dries out again, the substrate makes a difference. If your substrate barely holds much water, PlantDoc won't have as much water to absorb, and won't give as clear readings. That means fine to medium grade substrates with medium to high water retention work best.


Substrates with very low water retention can still work to some extent, but you won't get as accurate readings (like chunky or bark-based substrates), so they aren't the best match for using PlantDoc. No different than other water meters. Chunky substrates don't work well with any water meters. 


How to read PlantDoc


PlantDoc will change colour when wet and slowly return to white as the soil dries. You can decide when to water based on how dry your plant prefers to be.


MOIST

Peace Lily, Maranta, Stromanthe, Fern, Aglaonema, Anthurium and similar


For plants that like to stay lightly moist and are prone to dry leaf tips and margins if left dry for long, water again when PlantDoc is about 1/4 to 1/2 dry*


PARTIALLY DRY

Monstera, Philodendron, Fiddle Leaf Fig, Scindapsus, Epipremnum, Pothos and similar

For plants that prefer partially drying out before watering again, water again when PlantDoc is around 3/4 dry*


FULLY DRY

Hoya, Peperomia, ZZ and similar

For plants that like to fully dry between watering, water again when PlantDoc is fully dry*


DRY FOR A WHILE

Cacti and similar

For plants that love dry conditions for a while between watering, note when PlantDoc turns fully white and water again lightly in a couple of months* 


*Remember ALL moisture meters are only a guide, not gospel. They don't know what type of plant they're in. Moisture meters can only tell you what the moisture level is where they are in the plant, not when to water. You still need to decide when to water according to your plant's needs and your conditions. Moisture meters are a tool to help you read the signs. Don't ignore your plants other signs they need water, such as wilting.


How long does one PlantDoc last?


Although it does depend on how often you water and your type of soil, one PlantDoc normally lasts to 6 months. However (based on my own plants and watering habits), I found it was more around 1 to 3 months in my conditions.


In general I find for plants in a finer soil or plants that prefer to be maintained lightly moist (like a Peace Lily) it'll last shorter, vs plants in a grittier or chunkier mix that like to dry out fully between watering like Succulents and Cacti, where PlantDoc will last a lot longer. PlantDoc also 'reads' moisture better in soil types that are finer or hold more water.

Water your plant, not your PlantDoc! That can shorten its life. PlantDoc breaks down faster in always-wet, finer, more compact soil and lasts longer in drier, aroid-type potting mixes and with plants that prefer to dry out between watering.


When do you change PlantDoc?


You'll know when it's time for a new PlantDoc to take over when your PlantDoc no longer changes colour within half an hour of watering.


PlantDoc is also a great alert for pests and to help protect plant roots, as soil pests like fungus gnat larvae will chomp on your PlantDoc instead of your plant's roots. 


Why does PlantDoc turn brown?


Over time, some types of soils might stain your PlantDoc a brownish colour. More common with new soil or peat-based soils and new bark that have a higher tannin content. The same reason some plants turn drainage water yellowy-brown when you water them. Don't worry, that won't change the performance of your PlantDoc (but you can always change it early for the aesthetics if it does bother you).  


How does PlantDoc compare to other moisture meters?


All moisture meters have their pro's and con's but it can help to compare them to make the best choice for you and your plants. PlantDoc is the only fully biodegradable, plastic-free moisture meter in the world (patent pending).


SUSTEE

The closest type is Sustee. They also last a similar time, they also change colour, but Sustee is made of plastic (the core inside is partially compostable once you remove the plastic parts). PlantDoc is fully compostable and more budget-friendly.

Sustee cost between $16 and $22 per plant with refills around $8 to $11 per plant. PlantDoc are less than $5 per plant. Sustee do have 3 different sizes the largest size makes them better for deeper pots. PlantDoc is best from small to medium pots and measures the top 2 inches / 5cms of soil. Sustee are better for deeper pots. Like PlantDoc, Sustee don't work as well in chunkier substrates.


DIGITAL MOISTURE METERS

Unlike most digital meters, PlantDoc requires no batteries and can (and should!) be left in the plant. Digital water meters need to be moved from plant to plant manually to find out the moisture level. PlantDoc stays in the plant. 


3 IN 1 METERS

PlantDoc is more accurate than 3 in 1 type water meters with probes and gives you an immediate reading as you leave PlantDoc in your plant. The metal probes that 3 in 1 meters are made from erode in water so must NOT be left in plants, and need to be removed, cleaned and kept dry between use.  


PlantDoc don't last forever (I get 1 to 3 months use in my plants), but are fully biodegradable and 100% plastic-free. Good for our plants and the planet!

 

Shipping Notes
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SKU: 60521306777

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Phoenix, US
★★★★★ 1
Our dogs hurt their mouths chewing these bones
Color: Purple & Blue
I don't do a lot of reviews because I realize many are objective opinions. However, in this case I felt it was necessary to warn others. Our dogs are aggressive chewers. Their last rubber bones (not these) which we've purchased before, and recently purchased again, were destroyed quickly. Chunks of rubber came off the ends. Since those didn't hold up like they used to, I found these harder bones hoping they would last longer. They were able to gnaw into the hard plastic within a few minutes. This created sharp edges that cut their mouths. When I saw a bit of blood on the bones, I took them away from the dogs and threw them away. I wondered why they quit chewing on them after being so excited at first. Also, these are hard enough to damage a tooth.
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Reviewed in the United States on December 6, 2025
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Patricia Smith
Alexandria, US
★★★★★ 2
Pups have shown zero interest in these toys….
Color: Purple & Blue
I would agree that these are indestructible being neither of my dogs have shown any interest in these at all. At this rate they should last forever…
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Reviewed in the United States on April 10, 2026
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Cosmicethos
Carnegie, US
★★★★★ 4
Durable but losses interest
Color: Purple & Blue
My dog is an aggressive chewer. She was interested in this toy while it was new, but soon after lost interest. Good news is although it took a beating it did not break or splinter. If soppy toys are disposable in your house, give it a try.
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Reviewed in the United States on June 8, 2026
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Lazychick
Chelsea, US
★★★★★ 5
Great for Excessive Chewers and Eaters
Size: Large (Pack of 1), Product Packaging: Standard Packaging
I decided to get the Kong Extreme toy for my then 9-year-old dog in Sept. 2010, after her older sister passed away a few days before. I figured we both could have used the distraction. I learned ages ago that most toys couldn't hold up against my two Australian Cattle Dogs, since they didn't just happily gnaw on things, they'd try to eat it. In fact, they tried to eat a number of things, from fabrics to meticulously eating the lining off tennis balls and soft balls. Nothing was safe, especially against the youngest, who has some OCD issues. I'd be lucky to see a tough toy last a day, much less a month. Like the rest, I didn't think this toy would stand a chance, but it's still holding up well almost a year later. My dog isn't a strong chewer, like a doberman or pit, but very meticulous. She and her sister would go at something for hours if you let them, until nothing was left. Because of this, I also need to choose soft toys, rather than something hard, because she'll wear her teeth down if you let her. Fortunately, this manages to stand up to her obsessive chewing, but it also doesn't wear the teeth down, which I love. I'm thinking of getting a new one, even though the current could probably last another few months. I'm just now seeing some wear along the seams, despite her every effort to conquer and destroy it. I'm mainly getting it just to be on the safe side, so that I don't risk it falling apart while I'm not watching her, and just for the sake of cleanliness. These are extremely durable and easy to clean. They do have a strong odor when you first open them up, but it fades relatively quickly. I let ours soak it in hot/vinegar water for a while, then rinsed it well and left it out in the sun for a few hours. Seemed to help a little. They can also be loud when dogs chew on them, which can be annoying if you're trying to watch TV, but I find it well worth it, even if my partner doesn't agree during football time. I love the fact that these toys bounce unpredictably, although I would be careful around furniture if you plan to bounce it off the floor or toss it. I got into the habit of using it down our long hallway, referring to it as Dog Bowling, which she loves. She also didn't need food as incentive to get into it (just me playing with it and making it out to be a big deal), which is great, since that just means less cleaning and less weight gain in my book, although I do put treats in it now and then, if my partner and I are leaving the house and plan to be gone awhile. My dog's around around 30 lbs. and is medium sized, but has had no trouble tackling the larger-sized version, which was the only size available through Amazon at the time. I may get the medium-sized toy soon, just because she's reaching 10 and she'll go at it for ages. This is a great toy for obsessive chewers in particular, and I highly recommend it to dog lovers. I just wish we'd found out about them sooner! I'm also happy to report that she has stopped chewing on random things), like blankets and clothing, as much as she used to. If she does start up, it's because she can't find her Kong. I may also get the bone version and will review on that if I do.
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Reviewed in the United States on August 28, 2011
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Amazon Customer
Waukegan, US
★★★★★ 5
Great buy
Size: Large (Pack of 1), Product Packaging: Standard Packaging
Definitely recommend. My new rescue has chewed though I can’t even tell you how many “indestructible” toys in under 10 minutes. Not this! We’ve had it a few days and she loves it. Hasn’t chewed through it at all and it literally keeps her busy for an hour at the minimum. Would buy again. Great quality for the price and made to last. Perfect for aggressive chewers.
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Reviewed in the United States on April 8, 2026

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